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Coronadite

Type Locality
Horseshoe Mine, Coronado Mine, Coronado vein, Copper Plate Gulch, Copper Mountain District, Greenlee County, Arizona, USA
Mineral Data
Pb(Mn64+Mn23+)O16
Isostructural with: 
Cryptomelane
Ferrihollandite
Hollandite
Manjiroite
Strontiomelane
Strunz: 
4/D.08-70
Physical Properties
Colour: 
Dark gray, black
Crystal System: 
Monoclinic
Hardness: 
4½ - 5